OP asked; “Which gedolei poskim today…..”
My inquiry is simple. Such questions, involving pikuach nefesh should be answerable by anyone who is a posek. Pikuach nefesh is not a specialty area. When I hear someone ask “Which poskim” about a non-specialty area, I wonder whether the individual is shopping for a psak. That is greatly different from asking a shailoh. I wonder what the OP is asking.